Secondary cell and parts thereof



Dc. 2Q," B929. J. s. lRossLEY SECONDARY CELL AND PARTS THEREOF' Filed Nov. 26, 1926 s f1.1. W

mi@ @Y 1 Patented Oct. 29, 1.929

Parri-1 Nr oFFlcE JmEssTANLEY caossLEY, oF MooNEuroNDs, vrcroam, IAUSTRALIA sEcoIgDABY CELL AND PARTS THEREOF l I Application led November 26, 1926, Serial No. 150,956, andin Australia December 1, 1925.

My invention lrelates to secondary electric cells or accumulators, its-obj ects including to provide therefon an' improved element, and

vable materials, one of which is lead paste.

Another Objectis to secure an' unusually' high discharge'rate 'without damaging the cell plates.

By this inyention I aim at producing cells vwhich are more eitcient, more durable, and

relatively less expensive.

I produce an element which has a cylindrical or curved grid. To forgm a cell, several elements, divided by separators, are nested one. within the other.

vIn the process of ma/nufacture'of my ele-lv ment I use a mould which in one case is cylindrical and has a series of areas or spaces which, by centrifugal actlon, I cause deposltion of material which forms the grid. Or

I take flat material and curve it into a desired formi' Or I employ'a grid of wire or ofstrip material supported by the wall f a container which acts also-as the mould. By using`centrifgal action to locate the lead paste or equivalently'usablematerial in the gridI produce a consolidation which is dis-y tinguished by material advantage.

which also unctions asa separator.

cell.

Infsome my grid'has an outer'wall Figure 2 is a side sectional view on line F2 of Figure 1.

Figure 3 is a diagram showing on a small scale, a mouldin machine and mould, l

Figure -4 is a ragmentary perspective sectional view of a grid, having an outer separa- Figure 5 is a planof my improved cell. Figure 6 isl a vertical section 4of the said method of making it, and of depositing suit- Figure 7 is 'a .face view of a flat member which when curved becomes a cylindrical Figure 8 is a sectional plan of Figure 7. Figure 9 is a sectional view of a container'A enclosing a wire grid.

Figurel() 1s la sectional view of'my cellA containing a grid of wire-embedded in centrifugally deposited material and having a -cylindrical inner element having a grid of -wire also embedded material deposited centrifugally.

Figure 11 is a sectional view of an element usable in an alkaline cell. v

\ To form a mould I'take suitable strips 1 each arcuate in cross'segtion for example,

which when assembled form a hollow v body, the assembly being retainedby suitable means shown `as encircling rings 2. Rings vR locate the mould. This is usable in a spinning machine,I which I by way of example,"show as having a mould Acarrier which has end'plates l?, PJL connected by spacing rods T;

'The spinning machine shaft S supported in bearings B, and having a drive pulley D,

carries plates'l, P1, the `lattercbelng aper- 4tu'red, the aperture lO allowing oflaintroduction of 4material to be moulded. The shapes and sizes of moulds will vary according to the grid'desired. Other forms of spinning machines are obviously'v usable:

The mould illustrated has' suitable message 3,"l1d h'aS'grooves' of suitable arc which may be completely circumferential to form any redetermined number of grid bands 5 and ars 4.

The recesses 3' have faces 3b to form, on bars 4, faces 4 which are ada ted to key paste or other material in the gri and which are showninclined. I form va lug 4 on the grid b'y recessing the -mould as shown at.3.

Between the bars 4 aregaps 4b having ,any

predetermined positions and' dimensions, the

ands -5 being therefore also as'dpredetermined; that is, the sizes of l into it suitable material, for example molten grid parts are to -be varied to meet dilferent practical require-k lead which travels into and fills the recesses in the mould thus formin a grid. When sufficient material has been ed into the-mould and has set, rotation is stopped and the gridy lthus made is removed.

precipitate the silica and bind the whole ton gether, so that the shell 6 becomes a grid separator.

Or the separator is formable by enclosing the id in a cylinder of suitable material, as as estos, pulp or the like produced by centrifugal deposition, or in other suitable manner.

In order to fill its gaps or recesses, the grid is located in a separator 6, or any suitable shellv which may be temporary, and is rotatedin a' moulding machine while suitablematerial L, herein referred to as lead paste, is fed thereto, until the said gaps or recesses are packed,the surface produced being by obvious means made as smooth as desired. j

- I produce the lead paste in one case, by utilizing electrically precipitated metallic lead, which I have discovered to be particularly advanta eous. For example lead thus precipitate and mixed wit liltharge or red lead and lead wool forms a most effective compound, in making which, however, detail variations are usable.

In Fi res 5 and 6, 4 represent complete elements, that is filled grids, of which several of different diameters having means of separation are nested together ina container J shown as a jar to forma cell. Y

-The container is shown with a support 9, having grooves'9 in which are fitted ends of elements so that they are kept separate. As a modification, Figure 10 shows separators consisting of rods 10 of suitable material as glass.

To produce an element in which the grid is strip material 7, Wire for exampleofv suit able form, shown as coiled`,this strip is set. within the mould before rotation of the latter as aforesaid. In some cases a shell 8 may and iron and so on, with in each case suitable v Vvbe the mould, and be of jar form for further use as part of the cell. y The strip is` in effect a cage or skeleton 7 and when embeddedv in material 7, `Figure l0 a c lindrical element is produced.

invention is not limited to producing lead grids filled with lead or othersuitable paste, but is applicable to the utilization of -other` combinations of metals, as zinc "and lead, copper and lead copper and zinc; nickel electrolytes.

In using in combination nickel and iron, in-

' I form the said carbon cylinders contrifuvgally by depositing a mixture of carbon, a

binder and liquid in a mould or casing and ro- 'i tating it. The said casing may be destructiposited centrifugally on cylinder 1l, after which` the inner cylinder lla is positioned.

I claim 1. The process of forming electrode elements for secondary cells which comprisesv centrifugally depositing grid material in a ble by baking. The material 12 is then demold, so shaped as to give the formed grid a A recessed structure and thereafter centrifugally depositing grid paste material in the recesses of the grid.

2. In the process of forming electrode elements for secondary cells, the steps whichA comprise feeding molten metal into a rotating recessed mold to centrifugally deposit said metal in the recesses of the mold and forma grid and filling inthe recesses in the so formed grid with grid paste material.

3. In the process of forming electrode ele ments for secondary cells, the steps which comprise feeding molten metal into a rotating recessed'mold to centrifugally deposit said metal in the recesses of the mold and form a `grid and centrifugally depositing grid paste 

